1.

Ina Y oung's double slit experiment, separation between the slits is 2 xx 10^(-3) m and distance of the screen from the slit is 2.5 m. Light in the range of 2000 - 8000 Å is allowed to fall on the slits.Wvelength in the visible region that will be present on the screen at 10^(-3) m from the central maxima will be :

Answer»

`4000 Å`
`5000 Å`
`6000 Å`
`8000 Å`

Solution :`lambda =(xd)/(D) = 8000 Å`
For max. `n_(1)lambda_(1) = n_(2)lambda_(2) = n_(3)lambda_(3)`
If`n_(1) = 2 Rightarrow lambda_(1) = 4000 Å`
So VISIBLE region, SECOND bright line is present.


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